This interactive scatter plot visualizes sepal length versus sepal width for three iris species from Fisher's dataset. Hovering over legend items dims non-matching points to highlight species-specific clusters. The visualization uses D3.js v7 with `scaleLinear`, `scaleOrdinal`, `axisBottom`, and `axisLeft` APIs. Circle size and styling draw from a configurable BBC color theme, while a `ResizeObserver` handles responsive dimension updates.